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AGE-HARDENING IN A DENIAL CASTING LOW-CARAT GOLD ALLOY

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Abstract

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½ÃÆÇ Ä¡°úÁÖÁ¶¿ë ÀúÄ«¶óÆ® ±ÝÇÕ±ÝÀÇ ½ÃÈ¿°æÈ­ °Åµ¿À» ½ÃÂ÷¿­ ºÐ¼®, °æµµ½ÃÇè, Á¶Á÷°üÂû,
X-¼± ȸÀý ºÐ¼®À» ÅëÇÏ¿© Á¶»çÇÏ¿©, ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù.
1. ¿ëüȭó¸®µÈ ÇÕ±ÝÀº 300¡­400¡ÉÀÇ µî¿Â½ÃÈ¿ 󸮿¡ ÀÇÇØ °æµµ°¡ ½ÃÈ¿ Ãʱ⿡ ±Þ°ÝÈ÷
»ó½Â ÇÏ¿´°í ÀÏÁ¤±â°£ ¿Ï¸¸ÇÑ »ó½Â¸¦ º¸ÀÎ ÈÄ, ±Þ°ÝÈ÷ °¨¼ÒÇÏ¿´´Ù.
2. °æµµÀÇ »ó½ÂÀº ¥á»óÀÇ ±âÁö°¡ ÁؾÈÁ¤»ó AuCu I¡¯Çü ±ÔÄ¢»óÀ¸·Î º¯ÅÂÇÏ´Â °Í¿¡ ±âÀÎÇÏ
¿´´Ù.
3.°ú½ÃÈ¿ ¿¬È­´Â Ag-rich ¥á1»ó°ú AuCu IÇü ±ÔÄ¢»óÀÇ 2»óÀ¸·Î µÈ ¹Ì¼¼ÇÑ
Ãþ»óÁ¶Á÷ÀÇ ¼®Ãâ¹°¿¡ ±âÀÎÇÏ¿´´Ù.
#ÃÊ·Ï#
The age-hardening behavior of a commercial dental casting low-carat gold alloy was
investigated by means of differential thermal analysis, hardness test, optical microscopic
observation and X-ray diffraction study. The following results were obtained.
1, By the isothermal aging of this alloy at 300¡­400¡É, the hardness increased
markedly at the initial stage and continued to increased gradually for the time, and then
decreased dractically after longer aging time.
2. The hardening was attributed to the formation of the metastable AuCu I' ordered
phase from the ¥á matrix.
3. The overaging with softening was attributed to the precipitation of the fine lamellar
structure which was composed of the Ag-rich ¥á1 at and AuCu I ordered
phases.

Å°¿öµå

dsntal gold alloy; hardening; ovcraging; metastable phase; lamellar structure;

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